:root {
  --paper-bg: #f5f4f0;
  --paper-surface: #ffffff;
  --paper-text: #1f2328;
  --paper-muted: #667085;
  --paper-border: #d8dce2;
  --paper-accent: #6f42c1;
  --paper-accent-soft: #f1ebfb;
  --paper-max-width: 860px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 48px 24px;
  background: var(--paper-bg);
  color: var(--paper-text);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  line-height: 1.7;
}

.whitepaper {
  width: min(100%, var(--paper-max-width));
  margin: 0 auto;
  background: var(--paper-surface);
  border: 1px solid var(--paper-border);
  border-radius: 18px;
  box-shadow: 0 18px 50px rgba(31, 35, 40, 0.08);
  overflow: hidden;
}

.whitepaper-cover {
  min-height: 620px;
  padding: 88px 72px 72px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-bottom: 1px solid var(--paper-border);
  background:
    linear-gradient(
      135deg,
      rgba(111, 66, 193, 0.08),
      rgba(255, 255, 255, 0) 55%
    ),
    var(--paper-surface);
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--paper-accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.whitepaper-cover h1 {
  max-width: 700px;
  margin: 0;
  font-size: clamp(3rem, 8vw, 5.4rem);
  line-height: 0.98;
  letter-spacing: -0.045em;
}

.subtitle {
  max-width: 650px;
  margin: 28px 0 0;
  color: var(--paper-muted);
  font-size: 1.3rem;
  line-height: 1.55;
}

.document-meta {
  margin-top: 70px;
  padding-top: 22px;
  border-top: 1px solid var(--paper-border);
  color: var(--paper-muted);
  font-size: 0.95rem;
}

.document-meta p {
  margin: 3px 0;
}

.whitepaper-section {
  padding: 58px 72px;
  border-bottom: 1px solid var(--paper-border);
}

.whitepaper-section:last-child {
  border-bottom: 0;
}

.whitepaper-section h2 {
  margin: 0 0 24px;
  font-size: 2rem;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.whitepaper-section h3 {
  margin: 38px 0 12px;
  font-size: 1.2rem;
  line-height: 1.35;
}

.whitepaper-section p {
  max-width: 720px;
  margin: 0 0 20px;
}

.placeholder {
  color: var(--paper-muted);
}

.method-sequence {
  margin: 28px 0 32px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  counter-reset: method-step;
  list-style: none;
}

.method-sequence li {
  position: relative;
  padding: 18px 18px 18px 48px;
  border: 1px solid var(--paper-border);
  border-radius: 12px;
  background: #fafafa;
  font-weight: 650;
  counter-increment: method-step;
}

.method-sequence li::before {
  content: counter(method-step);
  position: absolute;
  top: 18px;
  left: 18px;
  color: var(--paper-accent);
  font-size: 0.84rem;
  font-weight: 800;
}

.trust-sequence {
  margin: 28px 0;
  padding: 22px 24px;
  border-left: 4px solid var(--paper-accent);
  background: var(--paper-accent-soft);
  font-weight: 700;
  line-height: 1.6;
}

.whitepaper-section ul {
  max-width: 720px;
  margin: 24px 0 0;
  padding-left: 24px;
}

.whitepaper-section li {
  margin-bottom: 12px;
}

.references {
  background: #fafafa;
}

@media (max-width: 760px) {
  body {
    padding: 0;
    background: var(--paper-surface);
  }

  .whitepaper {
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .whitepaper-cover,
  .whitepaper-section {
    padding-left: 28px;
    padding-right: 28px;
  }

  .whitepaper-cover {
    min-height: 540px;
    padding-top: 64px;
    padding-bottom: 56px;
  }

  .whitepaper-cover h1 {
    font-size: clamp(2.8rem, 15vw, 4.4rem);
  }

  .subtitle {
    font-size: 1.12rem;
  }

  .method-sequence {
    grid-template-columns: 1fr;
  }
}

.research-sequence {
  margin: 28px 0;
  padding: 20px 24px;
  border-left: 4px solid var(--paper-accent);
  background: var(--paper-accent-soft);
  font-weight: 750;
  line-height: 1.6;
}

.research-note {
  margin: 32px 0 0;
  padding: 22px 24px;
  border: 1px solid var(--paper-border);
  border-radius: 12px;
  background: #fafafa;
}

.research-note p {
  margin: 0;
}

.source-note {
  margin: 22px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--paper-border);
  color: var(--paper-muted);
  font-size: 0.92rem;
}

.source-note p {
  margin-bottom: 8px;
}

.source-note ul {
  margin-top: 8px;
}

.source-note li {
  margin-bottom: 6px;
}

/* =========================================================
   NILLANINJA SITE HEADER
   ========================================================= */

.whitepaper-site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
  background: rgba(5, 7, 10, 0.96);
  border-bottom: 1px solid rgba(148, 163, 184, 0.18);
  backdrop-filter: blur(18px);
}

.whitepaper-site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1180px, calc(100% - 48px));
  min-height: 72px;
  margin: 0 auto;
  padding: 10px 0;
}

.whitepaper-site-brand {
  display: flex;
  align-items: center;
  height: 52px;
  overflow: hidden;
}

.whitepaper-site-brand img {
  width: auto;
  height: 52px;
  max-height: 52px;
  object-fit: contain;
}

.whitepaper-back-link {
  color: #94a3b8;
  font-family: "Space Mono", monospace;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: color 180ms ease;
}

.whitepaper-back-link:hover,
.whitepaper-back-link:focus-visible {
  color: #f1f5f9;
}

@media (max-width: 760px) {
  .whitepaper-site-header-inner {
    width: calc(100% - 28px);
    min-height: 64px;
    padding: 8px 0;
  }

  .whitepaper-site-brand {
    height: 46px;
  }

  .whitepaper-site-brand img {
    height: 46px;
    max-height: 46px;
  }

  .whitepaper-back-link {
    font-size: 0.62rem;
  }
}

/* =========================================================
   PUBLIC SITE INTEGRATION
   ========================================================= */

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at 15% 8%, rgba(87, 227, 255, 0.08), transparent 28%),
    radial-gradient(circle at 88% 18%, rgba(124, 92, 255, 0.08), transparent 30%),
    #05070a;
}

body {
  padding: 0;
}

.whitepaper-site-header {
  margin: 0;
}

.whitepaper {
  margin-top: 0;
  margin-bottom: 72px;
}

/* =========================================================
   WHITE PAPER SITE FOOTER
   ========================================================= */

.whitepaper-site-footer {
  width: 100%;
  border-top: 1px solid rgba(148, 163, 184, 0.18);
  background: rgba(5, 7, 10, 0.96);
}

.whitepaper-site-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 28px 0 36px;
  color: #94a3b8;
  font-size: 0.8rem;
}

.whitepaper-footer-links {
  display: flex;
  gap: 22px;
}

.whitepaper-footer-links a {
  color: #94a3b8;
  text-decoration: none;
  transition: color 180ms ease;
}

.whitepaper-footer-links a:hover,
.whitepaper-footer-links a:focus-visible {
  color: #f1f5f9;
}

@media (max-width: 760px) {
  .whitepaper-site-footer-inner {
    width: calc(100% - 28px);
    flex-direction: column;
    align-items: flex-start;
  }

  .whitepaper-footer-links {
    flex-direction: column;
    gap: 10px;
  }
}